P6C.3 Although the hydrogen electrode may be conceptually the simplest electrode and is the basis for the choice of reference potential in electrochemical systems, it is cumbersome to use. Therefore, several substitutes for it have been devised. One of these alternatives is the quinhydrone electrode (quinhydrone, Q QH, is a complex of quinone, CH,O2= Q, and hydroquinone, C,H,0,H, = QH,), where the concentrations of Q QH, and QH, are equal to each other. The electrode half-reaction is Q(aq) + 2 H*(aq) + 2 e QH,(aq), E° = +0.6994 V. If the cell Hg(s)|Hg,Cl,(s)|HCI(aq)|Q-QH,JAu(s) is prepared, and the measured cell potential is +0.190 V, what is the pH of the HCl solution? %3D %3D %3D
P6C.3 Although the hydrogen electrode may be conceptually the simplest electrode and is the basis for the choice of reference potential in electrochemical systems, it is cumbersome to use. Therefore, several substitutes for it have been devised. One of these alternatives is the quinhydrone electrode (quinhydrone, Q QH, is a complex of quinone, CH,O2= Q, and hydroquinone, C,H,0,H, = QH,), where the concentrations of Q QH, and QH, are equal to each other. The electrode half-reaction is Q(aq) + 2 H*(aq) + 2 e QH,(aq), E° = +0.6994 V. If the cell Hg(s)|Hg,Cl,(s)|HCI(aq)|Q-QH,JAu(s) is prepared, and the measured cell potential is +0.190 V, what is the pH of the HCl solution? %3D %3D %3D
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:P6C.3 Although the hydrogen electrode may be conceptually the
simplest electrode and is the basis for the choice of reference potential
in electrochemical systems, it is cumbersome to use. Therefore, several
substitutes for it have been devised. One of these alternatives is the
quinhydrone electrode (quinhydrone, Q QH, is a complex of quinone,
CH,O,= Q, and hydroquinone, C,H,O,H, = QH,), where the concentrations
of Q QH, and QH, are equal to each other. The electrode half-reaction
is Q(aq) + 2 H'(aq) + 2 e QH,(aq), E° = +0.6994 V. If the cell
Hg(s)|Hg,Cl,(s)|HC(aq)|Q-QH,JAu(s) is prepared, and the measured cell
potential is +0.190 V, what is the pH of the HCl solution?
%3D
%3D
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